/**
 * Copyright (c) 2006 George Malamidis, nutrun.com
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this 
 * software and associated documentation files (the "Software"), to deal in the Software 
 * without restriction, including without limitation the rights to use, copy, modify, 
 * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to 
 * permit persons to whom the Software is furnished to do so, subject to the following 
 * conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies 
 * or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF 
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE 
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/**
 * $Author$
 * $Rev$
 */
package aerie.servlet;

import aerie.Container;
import groovy.util.ResourceException;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class AerieFilter implements Filter {
    private ServletContext servletContext;
    private static Container container;

    public void init(FilterConfig filterConfig) throws ServletException {
        try {
            servletContext = filterConfig.getServletContext();
            container = new Container(servletContext);
        } catch (ResourceException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain)
            throws IOException, ServletException {

        final HttpServletRequest request = (HttpServletRequest) servletRequest;
        final HttpServletResponse response = (HttpServletResponse) servletResponse;

        try {

            if (!isIgnored(request)) {
                new RequestHandler().respond(new RequestBinding(request, response, container));
            } else {
                chain.doFilter(servletRequest, servletResponse);
            }

        } catch (ResourceException e) {
            response.setStatus(HttpServletResponse.SC_NOT_FOUND);
            servletContext.log(e.getMessage(), e);
            response.sendError(HttpServletResponse.SC_NOT_FOUND, e.getMessage());
        } catch (Exception e) {
            response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            servletContext.log(e.getMessage(), e);
            response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e.getMessage());
        } finally {
            response.flushBuffer();
        }
    }

    public void destroy() {
    }

    private boolean isIgnored(HttpServletRequest request) {
        String contextPath = request.getContextPath();
        String uri = request.getRequestURI();
        return uri.startsWith(contextPath + "/static") || uri.startsWith(contextPath + "/favicon.ico");
    }
}
